Focus SVT engine knock

I just bought an 02 svt with 142,ooo on the clock. The focus suposedly has a rod knock. I am going to be trying to figure out for sure if that is the problem. Then I will try to fix it without pulling the motor?

After digging into it a little, it has a couple codes. Codes are P1381 and P1383. I used a stethoscope to try and narrow down the location of the knock. It seems like the noise is coming from the rear cam on the drivers side end of the motor. I am wondering if I have a valvetrain part going bad? I have only pulled the valve cover so far. It does sound like a rod till it gets full oil pressure while cold, but that goes away in just a second and does not come back unless the car sits for several hours again.

Some more background info.. The previous owner says the timing belt was done around 8000 miles ago and a tune up was done about 700 miles ago. Now, I am afraid (but not sure) he could have been fabricating a little bit of this info.? The paperwork for the tune up came with the car, no info. on the timing belt though.

The car runs decent besides the noise, I have only idled (reving it a littlle periodicly) it trying to trace the noise. I did drive it onto my car dollie and into my garage though. I do not think it has the right plugs in it, but the piston tops look fine. I wrote the #'s down, but forgot them on the car.

Sorry about the novel. Any advice would be appreciated.

Thanks